[Bug 1858412] Re: systemd vacuuming does not work for remote journals

[Dan Streetman]

xenial:

ubuntu at lp1858412-x:~$ dpkg -l systemd|grep systemd
ii  systemd        229-4ubuntu21.27 amd64        system and service manager
ubuntu at lp1858412-x:~$ du -sh /var/log/journal/remote
65M	/var/log/journal/remote
ubuntu at lp1858412-x:~$ sudo journalctl -D /var/log/journal/remote --vacuum-size=10M
ubuntu at lp1858412-x:~$ du -sh /var/log/journal/remote
65M	/var/log/journal/remote


ubuntu at lp1858412-x:~$ dpkg -l systemd|grep systemd
ii  systemd        229-4ubuntu21.28 amd64        system and service manager
ubuntu at lp1858412-x:~$ du -sh /var/log/journal/remote
65M	/var/log/journal/remote
ubuntu at lp1858412-x:~$ sudo journalctl -D /var/log/journal/remote --vacuum-size=10M
Deleted archived journal /var/log/journal/remote/system at 2cd50be57af347e1a473974288f23b15-0000000000000001-0005a4fe64b79740.journal (8.0M).
Deleted archived journal /var/log/journal/remote/system at 2cd50be57af347e1a473974288f23b15-000000000000047d-0005a4fe7e0e6b7b.journal (8.0M).
Vacuuming done, freed 16.0M of archived journals on disk.
ubuntu at lp1858412-x:~$ du -sh /var/log/journal/remote
49M	/var/log/journal/remote


** Tags removed: verification-needed verification-needed-xenial
** Tags added: verification-done verification-done-xenial

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Title:
  systemd vacuuming does not work for remote journals

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Committed
Status in systemd source package in Bionic:
  Fix Committed
Status in systemd source package in Disco:
  Won't Fix
Status in systemd source package in Eoan:
  Fix Committed

Bug description:
  [impact]

  attempting to vacuum journals using -D with the 'root' (in journald
  terms) journal directory fails to perform any vacuuming.  This can
  lead to journal files continually increasing in size and filling up
  the filesystem.

  [test case]

  see original description below.

  [regession potential]

  this removes a check in the code when iterating journal directories
  during vacuuming, so any regression would likely occur during
  vacuuming, possibly causing failure to vacuum.

  [scope]

  this is fixed upstream by commit
  c488660e6edb3c1375ab62514a8df035c3d712bf which is included starting in
  version 244, so this is already included in Focal.  This is needed for
  Eoan, Bionic, and Xenial.

  [original description]

  systemd has an issue in regard to vacuuming remote journals:
  https://github.com/systemd/systemd/issues/2376 - this affects 18.04 as
  this version still has this problem.

  Steps to reproduce on "Description:     Ubuntu 18.04.3 LTS":

  root at 1:~# du -hs /var/log/journal/remote/
  8.6G	/var/log/journal/remote/
  root at 1:~# journalctl -D /var/log/journal/remote --vacuum-size=100M
  root at 1:~# du -hs /var/log/journal/remote/
  8.6G	/var/log/journal/remote/

  Would it be possible to backport this trivial patch
  https://github.com/systemd/systemd/pull/13924 into 18.04?

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